Buggy code:
public class ErrorPathClassifier { private static final int BOOLEAN_VAR = 2 ; private static final int INTEQUAL_VAR = 4 ; private static final int UNKNOWN_VAR = 16 ; private static final int MAX_PREFIX_LENGTH = 1000 ; private static final int MAX_PREFIX_NUMBER = 1000 ; public static final String SUFFIX_REPLACEMENT = ( ErrorPathClassifier . class . getSimpleName ( ) ) + "<seq2seq4repair_space>replaced<seq2seq4repair_space>this<seq2seq4repair_space>edge<seq2seq4repair_space>in<seq2seq4repair_space>suffix" ; private static final String PREFIX_REPLACEMENT = ( ErrorPathClassifier . class . getSimpleName ( ) ) + "<seq2seq4repair_space>replaced<seq2seq4repair_space>this<seq2seq4repair_space>assume<seq2seq4repair_space>edge<seq2seq4repair_space>in<seq2seq4repair_space>prefix" ; private static int invocationCounter = 0 ; private final Optional < VariableClassification > classification ; private final Optional < LoopStructure > loopStructure ; public static enum ErrorPathPrefixPreference { DEFAULT ( ) , SHORTEST ( ) , LONGEST ( ) , DOMAIN_BEST_SHALLOW ( ErrorPathClassifier . FIRST_LOWEST_SCORE ) , DOMAIN_BEST_BOUNDED ( ErrorPathClassifier . FINAL_LOWEST_SCORE_BOUNDED ) , DOMAIN_BEST_DEEP ( ErrorPathClassifier . FINAL_LOWEST_SCORE ) , REFINE_SHALLOW ( ErrorPathClassifier . FIRST_HIGHEST_SCORE ) , REFINE_DEEP ( ErrorPathClassifier . FINAL_LOWEST_SCORE ) , RANDOM ( ) , MEDIAN ( ) , MIDDLE ( ) , DOMAIN_WORST_SHALLOW ( ErrorPathClassifier . FIRST_HIGHEST_SCORE ) , DOMAIN_WORST_DEEP ( ErrorPathClassifier . FINAL_HIGHEST_SCORE ) ; private ErrorPathPrefixPreference ( ) { } private ErrorPathPrefixPreference ( Function < Triple < Long , Long , Integer > , Boolean > scorer ) { } private Function < Triple < Long , Long , Integer > , Boolean > scorer = ErrorPathClassifier . INDIFFERENT_SCOREKEEPER ; } private static final Function < Triple < Long , Long , Integer > , Boolean > INDIFFERENT_SCOREKEEPER = new Function < Triple < Long , Long , Integer > , Boolean > ( ) { @ Override public Boolean apply ( Triple < Long , Long , Integer > prefixParameters ) { } } ; private static final Function < Triple < Long , Long , Integer > , Boolean > FIRST_HIGHEST_SCORE = new Function < Triple < Long , Long , Integer > , Boolean > ( ) { @ Override public Boolean apply ( Triple < Long , Long , Integer > prefixParameters ) { } } ; private static final Function < Triple < Long , Long , Integer > , Boolean > FINAL_HIGHEST_SCORE = new Function < Triple < Long , Long , Integer > , Boolean > ( ) { @ Override public Boolean apply ( Triple < Long , Long , Integer > prefixParameters ) { } } ; private static final Function < Triple < Long , Long , Integer > , Boolean > FIRST_LOWEST_SCORE = new Function < Triple < Long , Long , Integer > , Boolean > ( ) { @ Override public Boolean apply ( Triple < Long , Long , Integer > prefixParameters ) { } } ; private static final Function < Triple < Long , Long , Integer > , Boolean > FINAL_LOWEST_SCORE = new Function < Triple < Long , Long , Integer > , Boolean > ( ) { @ Override public Boolean apply ( Triple < Long , Long , Integer > prefixParameters ) { } } ; private static final Function < Triple < Long , Long , Integer > , Boolean > FINAL_LOWEST_SCORE_BOUNDED = new Function < Triple < Long , Long , Integer > , Boolean > ( ) { @ Override public Boolean apply ( Triple < Long , Long , Integer > prefixParameters ) { } } ; public ErrorPathClassifier ( Optional < VariableClassification > pClassification , Optional < LoopStructure > pLoopStructure ) { } public ARGPath obtainSlicedPrefix ( ErrorPathClassifier . ErrorPathPrefixPreference preference , ARGPath errorPath , List < ARGPath > pPrefixes ) { } private ARGPath obtainShortestPrefix ( List < ARGPath > pPrefixes , ARGPath originalErrorPath ) { } private ARGPath obtainLongestPrefix ( List < ARGPath > pPrefixes , ARGPath originalErrorPath ) { } private ARGPath obtainDomainTypeHeuristicBasedPrefix ( List < ARGPath > pPrefixes , ErrorPathClassifier . ErrorPathPrefixPreference preference , ARGPath originalErrorPath ) { } private ARGPath obtainRefinementRootHeuristicBasedPrefix ( List < ARGPath > pPrefixes , ErrorPathClassifier . ErrorPathPrefixPreference preference , ARGPath originalErrorPath ) { } private ARGPath obtainRandomPrefix ( List < ARGPath > pPrefixes , ARGPath originalErrorPath ) { } private ARGPath obtainMedianPrefix ( List < ARGPath > pPrefixes , ARGPath originalErrorPath ) { } private ARGPath obtainMiddlePrefix ( List < ARGPath > pPrefixes , ARGPath originalErrorPath ) { } private List < ARGPath > limitNumberOfPrefixesToAnalyze ( List < ARGPath > pPrefixes , ErrorPathClassifier . ErrorPathPrefixPreference preference ) { switch ( preference ) { case DOMAIN_BEST_BOUNDED : case DOMAIN_BEST_SHALLOW : case DOMAIN_WORST_SHALLOW : case REFINE_SHALLOW : <START_BUG> return pPrefixes . subList ( 0 , ErrorPathClassifier . MAX_PREFIX_NUMBER ) ; <END_BUG> case DOMAIN_BEST_DEEP : case DOMAIN_WORST_DEEP : case REFINE_DEEP : return pPrefixes . subList ( Math . max ( 0 , ( ( ( pPrefixes . size ( ) ) - ( ErrorPathClassifier . MAX_PREFIX_NUMBER ) ) - 1 ) ) , ( ( pPrefixes . size ( ) ) - 1 ) ) ; default : assert false : "No<seq2seq4repair_space>need<seq2seq4repair_space>to<seq2seq4repair_space>filter<seq2seq4repair_space>for<seq2seq4repair_space>" + preference ; } return pPrefixes ; } private Set < String > obtainUseDefInformationOfErrorPath ( MutableARGPath currentErrorPath ) { } public Long obtainDomainTypeScoreForVariables ( Set < String > useDefinitionInformation ) { } private ARGPath buildPath ( final int bestIndex , final List < ARGPath > pPrefixes , final ARGPath originalErrorPath ) { } private static List < Pair < ARGState , CFAEdge > > pathToList ( ARGPath path ) { } private void replaceAssumeEdgeWithBlankEdge ( final MutableARGPath pErrorPath ) { } private ARGPath concatPrefixes ( List < ARGPath > pPrefixes ) { } @ SuppressWarnings ( "unused" ) private void exportToDot ( MutableARGPath errorPath , List < MutableARGPath > pPrefixes ) { } private SetMultimap < ARGState , ARGState > buildSuccessorRelation ( ARGState target ) { } public long obtainScoreForPrefixes ( List < ARGPath > pPrefixes , ErrorPathClassifier . ErrorPathPrefixPreference preference ) { } }

Fix:
return pPrefixes . subList ( 0 , Math . min ( ( ( pPrefixes . size ( ) ) - 1 ) , ErrorPathClassifier . MAX_PREFIX_NUMBER ) ) ;